/*
    SDL_main.c, placed in the public domain by Sam Lantinga  4/13/98

    The WinMain function -- calls your program's main() function
 */

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>

#include <windows.h>
#include <malloc.h>

/* Include the SDL main definition header */
#include "SDL.h"
#include "SDL_main.h"
#ifdef main
#ifndef _WIN32_WCE_EMULATION
#undef main
#endif
#endif

#if SDL_MAJOR_VERSION == 1

/* Do we really not want stdio redirection with Windows CE? */
#ifdef _WIN32_WCE
#define NO_STDIO_REDIRECT
#endif

/* The standard output files */
#define STDOUT_FILE     TEXT("stdout.txt")
#define STDERR_FILE     TEXT("stderr.txt")

#if defined(_WIN32_WCE) && _WIN32_WCE < 300
/* seems to be undefined in Win CE although in online help */
#define isspace(a) (((CHAR)a == ' ') || ((CHAR)a == '\t'))

/* seems to be undefined in Win CE although in online help */
char *strrchr(char *str, int c)
{
	char *p;

	/* Skip to the end of the string */
	p = str;
	while (*p)
		p++;

	/* Look for the given character */
	while ((p >= str) && (*p != (CHAR)c))
		p--;

	/* Return NULL if character not found */
	if (p < str) {
		p = NULL;
	}
	return p;
}
#endif /* _WIN32_WCE < 300 */

/* Parse a command line buffer into arguments */
static int ParseCommandLine(char *cmdline, char **argv)
{
	char *bufp;
	int argc;

	argc = 0;
	for (bufp = cmdline; *bufp; ) {
		/* Skip leading whitespace */
		while (isspace(*bufp)) {
			++bufp;
		}
		/* Skip over argument */
		if (*bufp == '"') {
			++bufp;
			if (*bufp) {
				if (argv) {
					argv[argc] = bufp;
				}
				++argc;
			}
			/* Skip over word */
			while (*bufp && (*bufp != '"')) {
				++bufp;
			}
		} else {
			if (*bufp) {
				if (argv) {
					argv[argc] = bufp;
				}
				++argc;
			}
			/* Skip over word */
			while (*bufp && !isspace(*bufp)) {
				++bufp;
			}
		}
		if (*bufp) {
			if (argv) {
				*bufp = '\0';
			}
			++bufp;
		}
	}
	if (argv) {
		argv[argc] = NULL;
	}
	return argc;
}

/* Show an error message */
static void ShowError(const char *title, const char *message)
{
/* If USE_MESSAGEBOX is defined, you need to link with user32.lib */
#ifdef USE_MESSAGEBOX
	MessageBox(NULL, message, title, MB_ICONEXCLAMATION | MB_OK);
#else
	fprintf(stderr, "%s: %s\n", title, message);
#endif
}

/* Pop up an out of memory message, returns to Windows */
static BOOL OutOfMemory(void)
{
	ShowError("Fatal Error", "Out of memory - aborting");
	return FALSE;
}

/* Remove the output files if there was no output written */
static void __cdecl cleanup_output(void){
#ifndef NO_STDIO_REDIRECT
	FILE *file;
	int empty;
#endif

	/* Flush the output in case anything is queued */
	fclose(stdout);
	fclose(stderr);

#ifndef NO_STDIO_REDIRECT
	/* See if the files have any output in them */
	file = fopen(STDOUT_FILE, "rb");
	if (file) {
		empty = (fgetc(file) == EOF) ? 1 : 0;
		fclose(file);
		if (empty) {
			remove(STDOUT_FILE);
		}
	}
	file = fopen(STDERR_FILE, "rb");
	if (file) {
		empty = (fgetc(file) == EOF) ? 1 : 0;
		fclose(file);
		if (empty) {
			remove(STDERR_FILE);
		}
	}
#endif
}

#if defined(_MSC_VER) && !defined(_WIN32_WCE)
/* The VC++ compiler needs main defined */
#define console_main main
#endif

/* This is where execution begins [console apps] */
int console_main(int argc, char *argv[])
{
	int n;
	char *bufp, *appname;

	/* Get the class name from argv[0] */
	appname = argv[0];
	if ((bufp = strrchr(argv[0], '\\')) != NULL) {
		appname = bufp + 1;
	} else if ((bufp = strrchr(argv[0], '/')) != NULL) {
		appname = bufp + 1;
	}

	if ((bufp = strrchr(appname, '.')) == NULL)
		n = strlen(appname);
	else
		n = (bufp - appname);

	bufp = (char*)alloca(n + 1);
	if (bufp == NULL) {
		return OutOfMemory();
	}
	strncpy(bufp, appname, n);
	bufp[n] = '\0';
	appname = bufp;

	/* Load SDL dynamic link library */
	if (SDL_Init(SDL_INIT_NOPARACHUTE) < 0) {
		ShowError("WinMain() error", SDL_GetError());
		return FALSE;
	}
	atexit(cleanup_output);
	atexit(SDL_Quit);

#ifndef DISABLE_VIDEO
#if 0
	/* Create and register our class *
	   DJM: If we do this here, the user nevers gets a chance to
	   putenv(SDL_WINDOWID).  This is already called later by
	   the (DIB|DX5)_CreateWindow function, so it should be
	   safe to comment it out here.
	   if ( SDL_RegisterApp(appname, CS_BYTEALIGNCLIENT,
	                     GetModuleHandle(NULL)) < 0 ) {
	        ShowError("WinMain() error", SDL_GetError());
	        exit(1);
	   }*/
#else
	/* Sam:
	   We still need to pass in the application handle so that
	   DirectInput will initialize properly when SDL_RegisterApp()
	   is called later in the video initialization.
	 */
	SDL_SetModuleHandle(GetModuleHandle(NULL));
#endif /* 0 */
#endif /* !DISABLE_VIDEO */

	/* Run the application main() code */
	SDL_main(argc, argv);

	/* Exit cleanly, calling atexit() functions */
	exit(0);
}

/* This is where execution begins [windowed apps] */
#ifdef _WIN32_WCE
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPWSTR szCmdLine, int sw)
#else
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR szCmdLine, int sw)
#endif
{
	HINSTANCE handle;
	char **argv;
	int argc;
	char *cmdline;
#ifdef _WIN32_WCE
	wchar_t *bufp;
	int nLen;
#else
	char *bufp;
#endif
#ifndef NO_STDIO_REDIRECT
	FILE *newfp;
#endif

	/* Start up DDHELP.EXE before opening any files, so DDHELP doesn't
	   keep them open.  This is a hack.. hopefully it will be fixed
	   someday.  DDHELP.EXE starts up the first time DDRAW.DLL is loaded.
	 */
	handle = LoadLibrary(TEXT("DDRAW.DLL"));
	if (handle != NULL) {
		FreeLibrary(handle);
	}

#ifndef NO_STDIO_REDIRECT
	/* Redirect standard input and standard output */
	newfp = freopen(STDOUT_FILE, "w", stdout);
	if (newfp == NULL) {    /* This happens on NT */
#if !defined(stdout)
		stdout = fopen(STDOUT_FILE, "w");
#else
		newfp = fopen(STDOUT_FILE, "w");
		if (newfp) {
			*stdout = *newfp;
		}
#endif
	}
	newfp = freopen(STDERR_FILE, "w", stderr);
	if (newfp == NULL) {    /* This happens on NT */
#if !defined(stderr)
		stderr = fopen(STDERR_FILE, "w");
#else
		newfp = fopen(STDERR_FILE, "w");
		if (newfp) {
			*stderr = *newfp;
		}
#endif
	}
	setvbuf(stdout, NULL, _IOLBF, BUFSIZ);  /* Line buffered */
	setbuf(stderr, NULL);                   /* No buffering */
#endif /* !NO_STDIO_REDIRECT */

#ifdef _WIN32_WCE
	nLen = wcslen(szCmdLine) + 128 + 1;
	bufp = (wchar_t*)alloca(nLen * 2);
	GetModuleFileName(NULL, bufp, 128);
	wcsncpy(bufp + wcslen(bufp), szCmdLine, nLen - wcslen(bufp));
	nLen = wcslen(bufp) + 1;
	cmdline = (char*)alloca(nLen);
	if (cmdline == NULL) {
		return OutOfMemory();
	}
	WideCharToMultiByte(CP_ACP, 0, bufp, -1, cmdline, nLen, NULL, NULL);
#else
	/* Grab the command line (use alloca() on Windows) */
	bufp = GetCommandLine();
	cmdline = (char*)alloca(strlen(bufp) + 1);
	if (cmdline == NULL) {
		return OutOfMemory();
	}
	strcpy(cmdline, bufp);
#endif

	/* Parse it into argv and argc */
	argc = ParseCommandLine(cmdline, NULL);
	argv = (char**)alloca((argc + 1) * (sizeof *argv));
	if (argv == NULL) {
		return OutOfMemory();
	}
	ParseCommandLine(cmdline, argv);

	/* Run the main program (after a little SDL initialization) */
	return console_main(argc, argv);
}
#endif

